Car ventilator



Nov. 20, 1928. 1,692,125

T. M. HYMAN CAR VENTILATOR Filed Jan. 14, 1925 ilk/we Thomas /Z fi man Patented Nov. 20, 1928.

UNI T 'E D- ST T S r HoMA-sM. HYMAN, or MONTREAL, QUEBEC, mama? can vEivtIzILa'roa- Application filed, January 14, 1925. sea ed; 2,429.

This invention relates to improvements in ventilators, and more particularly to root ventilators'for railway cars havingeither the turret or turtle-back types of roots. v The primary object otthe invention is to provide a ventilator so constructed and arranged that it will produce a positiv'es'uction when the car is moving, even at low speeds in either direction, to eXtractffoul air from the interior ofthe car. i

A further object is to-provide a ventilator so constructed and arranged as to positively exclude dust. v a

Various other objects and advantages may be ascertained "fromth'e following description. i r

The ventilator comprises, briefly a down.- wardly 'opening suctionc passage leading from the interior of the car and terminating a short distance above'the roof and prefcrably'below itsinlet end. The ends of the passage are covered by screens through both of which the a air flows 'outwardlynj Downwardly curving air ducts or blast passages are provided having flared mouths facing the ends of the car and discharge orifices locatedv at approx-i-' mately the same plane'as the discharge end of the suction. passage, the ducts being in clined to the horizontal so that a current of air flowing-through .either'will strike theroo'f' at an angle of less thanf90 and flow at high speed between theend of the suction passage and the roof thus withdrawing air' froin the car through the suctionpassage.

In. the accompanying drawings which illustrate one embodiment of the invention suitable for use with turret type roofs V Fig. 1 is a side elevationof the ventilator in position and partly in vertical section on the line 11, Figure 2. p i a Fig. 2 is an end elevation of the ventilator.

. Fig. 3 is a vertical cross sectional view-of the ventilator on the line 3 3, Figure 1.

Fig. 4 is-a bottom plan view of the ventilator.

Fig. 5 is an end elevation, on a reduced scale, illustrating adaption of the ventilator to a turtle back roof.

Referring more particularly to the drawings, 11 designates the lower deck of a car roof, 12 the upper deck and 13 the sides of the roof turret in which the usual ventilating openings are provided.

In that embodiment of the invention suitable for use with a turret roof, the ventilator projects laterally from the side of the turret alld' overh angs t'lie'lower deckof the car roof; as clearly shown in Figu'resQ and 3, but in the caseof a't'uitle-ba'l': roof the"ventilator; 3'roects upwardly from the roof and is turned downwardly through appioitinrately' 180 in topr'o'xiinity with" the roof, as shown in Figure 5 The form of ventilator suitable for'use with a tur'ret'roof comprises a base plate 14 torattachmen't to the turret side wall and haying ajsuitafbly shaped opening 15- protected b' 'a wire screen lti'of suitably fine mesh.

A 'hood is provided which has aro'o'fing wall 17 sloping outwardly and downwardly "from the 'plate Mffrom abovethe level of'the top of'the opening'lato a level below the bottom of theopening' and joinedto' a bottom wall 17 which projects outwardly from thebase plate from'below the opening 15, said bottom wall-havinga screened o ening 20form i'ng anoutlet for the'hood. I he upper part ojfjthehood'is supported by end walls 18 wfvhichjpreferably are vertical and project at right anglesfrom the'plate l4 to'whioh they and'the hood are attached by flanges 19. The hood andthe endfwalls form a suction passafge having a latera'lly directed inletand a downwardly directed outlet so-that the'passage turns through approximately 90. The

bottomfopening O of the hood isprovi'ded with asulbs'ta'ntially horizontalwi'r'e screen 21.; Tubular casings, forming air ducts or blast passages22, are provided at each end of the hood "being arranged between the bot tom wall 17 and'the lower longitudinal e'dges of the end walls 18 and' haveflared months 23 7 opening toward the opposite endsofthe car,

the ducts incliningdownwardly from their mouths," toward thetransverse' central plane ofthe hood so asto restrict the suction pas-' sage toward its outlet, The discharge ends QlEDfthGSeduCts' ar'e locatedin substantially the same pla'ne'as the? bottom opening 20 of.

the suction passage [and are preferably of equal or greater" width, The inclination of the ducts is such that a'current of air flowing through either will impinge upon the lower deck of the roof at an acute angle and at a point substantially beneath the adjacent edge of the suction passage opening, the angle of impingement being such that the current of air naturally flows between the end of the suction passage and the lower deck of the roof across the passage opening so as'to create a suction capable'of withdrawing air from within the passage, which withdrawn air isreplaced by air flowing through the screen 1 16 from the'interior of the car; The space between the bottom of the'ventilator and the roof constitutes an air channel through which air may flow across the outlets of the suction and blast passages and into which channel these passages discharge. inclination of the lower walls of the blast passages relatively'to the roof, this channel is tapered from its ends toward the intermediate portion into which the passages discharge. Preferably the outlet of the suction passage is. elongated transversely of the direction of flow of air emerging from the blast passages inorder to obtain the best suction effect.

When the car 'is in motion even at relatively low speeds, air is gathered by the advancing open, end of the channel and by reason of the taper in the channel is slightly compressed so as to flow with considerable velocity directly across the open end of the suction passage. In the same way the forwardly facing blast passage gathers air which is compressed and discharged into the channel at a point in advance of the suction passage outlet and in an inclined direction. The inclination of this air current is assuredby the inclination of 'the passage and is such that it impinges upon the air current flowing through the channel or upon the car roof and directs the flow of air away from the mouth of the suction passage. The combined action of the two air currents produces a strong out-' ward flow of air inthe suction passage, which serves to keep air in the channel from eddying into the suction passage, and also serves to blow dust'away from the mouth of the sucby a gust of air falls back through the screen either with or without striking the under surface of the hood.

In the illustrated embodiment of the invention, the suctionpassageturns through approximately 90 and the inner screen 16 is vertically disposed solely because of the type of roof'to which it" is applied. VVhenthe By reason of the ventilator is applied to a turtle-back type of roof the suction passage willturnthrough approximately 180 and the inner screen will be disposed approximately horizontal, as shown in Figure 5, but in other respects the "ventilator will be substantially as described.

In either case the fundamental features will be the same, also the principle ofoperation,

the difierencebeing merelyin the length and shape of the suction passage to accommodate the ventilator to thediiferent types of roofs,

While the invention has been described only in connection with railroad cars it will be un derstood that its'use is not thuslimited.

WVhile the constructions described and illustrated are at the present time preferred, it willbe understood that many modifications of detail may be made without departing from the spirit of the invention.

Having thus described my invention, what I claim is a a In a ventilator, a base plate having a' screened openlng forming an inlet, a 'hood mounted thereon and presenting; a roofing er longitudinal edges spaced from the said bottom wall, and tubular casings disposed within the spaces between'the bottom wall and the said endwallsto provide air ducts for directing a current of air transversely of the openingin thesaid bottom wall and having flared mouths disposed in advance of the end walls and havingltheir respective 'dis- I charge ends locatedln the same plane as the 1 outlet of the hood, said casings inclining downwardly from their mouths towards. the transverse central plane of the hood-to restrict the passage of the latter towards its outlet; said hood being attached to the base plate by flanges on the wallsthereof. V

In witness whereof, I have hereunto set my hand. 1

THOMAS'MIHYMANQV 

